The results showed the deposit has a "significant" component of coarse large flake graphite, which is a higher value product.
A large portion of the flakes are coarse (20 mesh to 100 mesh) and easily concentrated by a simple gravity process (the light portion being the valuable product).
"These positive results from initial characterization work show a large portion of coarse large flake within the sampled intervals of zone 1 graphite intercepts," said Tom Yingling, president and chief executive.
"This demonstrates that the deposit has a significant component of coarse large flake graphite, a higher value product.
He added: "Further metallurgical testing will be needed to design an efficient graphite concentration process which will be critical to the project economics as we continue to develop this exciting opportunity.
"Further metallurgical studies will build on these initial results. Samples from phase 2 and 3 drilling will be used."
Six composites were prepared from the drill holes, which were representative of the geology outlined through the completion of the earlier drill programmes.
Berkwood said the work will be used to inform the further design of a proposed metallurgical programme.
This larger programme will include samples from all the drilling undertaken through to the completion of the phase 3 programme currently in progress.
On Monday this week, the firm told investors it had resumed resource expansion and definition drilling on zone 1 at Lac Gueret.
The work - a phase 3 programme - includes a planned 1,500 metres (m) of drilling in nine diamond drill holes to further test for strike continuity of mineralisation.
The firm also hopes to improve its understanding of the orientation of the mineralised horizons, and to further define graphite mineralisation at the Zone 1 graphite prospect.